LTE-M flood sensor that measures water depth and predicts flash flood risk using local rainfall models.

A municipal flood management authority deploying an early warning sensor network across urban drainage basins and known flood-risk areas.
Building a submersible, battery-operated sensor that can measure water depth with millimeter accuracy, survive complete submersion, and provide early flash flood warnings.
The Nordic nRF9160 LTE-M SiP reads an MS5837 high-precision pressure sensor (depth resolution 2mm) and a tipping bucket rain gauge. An overmolded IP69K housing withstands permanent submersion.
Barometric pressure compensation is done using a co-located BME280 (subtracting atmospheric pressure from total pressure to derive water depth). If depth exceeds 50mm and rainfall rate exceeds 25mm/h, an immediate flood alert is sent via LTE-M.
±5mm water depth accuracy. 5+ year battery life. Provided 20-minute advance flash flood warning during monsoon season pilot.
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